#############################Proposta A#################################

###### Morphological measures between similar species#########.

The function goal is demonstrated differences in morphological dimensions between similar species. 
For this example it will use in measures used in frogs.

Home: table/data.frame containing information on measures of each species. 
In total 11 morphological variables will evaluate: (1) Snout-vent length (SVL); (2) head width (HW); 
(3) head length (HL); (4) Upper eyelid width (UEW), (5) horizontal eye diameter (ED); 
(6) eye-nostril distance (END); (7) inter-orbital distance (IOD); (8) inter-narial distance (IN); 
(9) tympanum diameter (TD); (10) tibia length (TL); (11) foot length (FL).

Function operation= 

•	Variance and standard deviation in dimensions of each species
•	Differences between means of each dimensions for the species
•	To assess normality in data distribution:
o	Normal – PCA
o	Not normal – KruscalWalis
•	Making graphics
o	Multivariate anova/PCA
•	Output – table with the descriptive information (means, variance and standard deviation), and graphics PCA.

With this function are identified quantitative differences between similar species.

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##########Percentage of purines and pyrimidines in a DNA sequence#######

Two functions for know the percentage of purines and pyrimidines in DNA sequence of diffrente taxas. 
The function goals are identify the frequency and perform analysis to determine the presence of differences 
significant between taxas. In the end, these results will be shown by graphs.

Home: file.txt containing the sequence of DNA.

First funtion: purines

Operation of the function:

•	Sum the amount of purines ("A" and "G") that occur along a DNA sequence.
•	Divide this sum over the total bases containing the DNA sequence and multiplies this value by 100.

Second function: pyrimidine
•	Sum the amount of pyrimidines ("C" and "T") that occur along a DNA sequence.
•	Divide this sum over the total bases containing the DNA sequence and multiplies this value by 100.
